A. If the water temperature is under 40±2 (degrees Celsius) , the LED faucet light will be blue light;

B. If the water temperature is over 40±2 (degrees Celsius) , the LED faucet light will be red light.

C. The other color change can be designed as per the request on the temperature.

This is our new version, it will be driven by turbine (water pressure), no battery or power supply is needed. 

Fantastic product, you are deserved to have one!  

All are made of copper, not plastic or other metal!